El Dorado

Bruce Force has gone to Las Vegas, the El Dorado for gamblers. He is interested especially in one betting game, where a machine forms a sequence of n numbers by drawing random numbers. Each player should estimate beforehand, how many increasing subsequences of length k will exist in the sequence of numbers.



Bruce doesn't trust the Casino to count the number of increasing subsequences of length k correctly. He has asked you if you can solve this problem for him.

The input contains several test cases. The first line of each test case contains two numbers n and k (1 ≤ k ≤ n ≤ 100), where n is the length of the sequence drawn by the machine, and k is the desired length of the increasing subsequences. The following line contains n pairwise distinct integers a_i (-10000 ≤ a_i ≤ 10000 ), where a_i is the i^th number in the sequence drawn by the machine.

The last test case is followed by a line containing two zeros.

For each test case, print one line with the number of increasing subsequences of length k that the input sequence contains. You may assume that the inputs are chosen in such a way that this number fits into a 64 bit signed integer .

10 5
1 2 3 4 5 6 7 8 9 10
3 2
3 2 1
0 0

252
0

2008水题公开赛（比速度，OJ压力测试）